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Q.

Six particles each of mass 'm' are placed at six vertices A,B,C. D,Eand F of a regular hexagon of side 'a'. A seventh particle of mass 'M' is kept at centre 'O' of the hexagon. Find net force on ' M ' if particle at Ais removed.

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a

GMma  (towards D )

b

0

c

GMma2 (towards D )

d

None of the above

answer is C.

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Detailed Solution

When particle at Ais removed then FA is removed. So, there is no force to cancel FD.

Fnet =FD=GMma2 (towards D ) 

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